中介子

It is in accordance with the prediction of QCD factorization approach.

在研究B介子非轻子衰变过程中，已有多种方法。

In all these studies, the vacuum fluctuation on nucleon,Δ-isobar, and σ meson is considered.

在以上所有的分析中，考虑了核子、Δ粒子和σ介子的真空起伏。

An elementary particle in the lepton family, having a mass209 times that of the electron, a negative electric charge, and a mean lifetime of2.2?

介子轻子族中的一种基本微粒，其质量为电子的209倍，是一种负电荷，平均寿命为2.2？

People through nuclear reactions, have been synthesized 17 kinds of atomic number greater than 92 of the transuranic elements, and thousands of The new kinds of radioactive nuclides, and by high-energy and ultra-high energy-ray beam and the interaction of atomic nuclei and found hundreds of kinds of short-lived particles, namely, baryon, meson, lepton, and particle resonance states of these particles has led to a new field of study - the birth of particle physics since the age of .70, nuclear physics has entered a deep development and wide application of new, more mature stage, on the one hand the development of particle acceleration and detection techniques, expanding people's research in nuclear means, the other hand, nuclear technology to serve the national economy, for example, for the development and utilization of nuclear energy to provide more accurate nuclear data; the use of isotope tracer technique diagnosis and treatment of disease; the use of radiation and irradiation preservation of food, irradiation breeding .

人们通过核反应，已经人工合成了17种原子序数大于92的超铀元素和上千种新的放射性核素，并且通过高能和超高能射线束和原子核的相互作用，发现了上百种短寿命粒子、即重子、介子、轻子和共振态粒子，对这些粒子的研究导致了一门新学科——粒子物理学的诞生。70年代以来，核物理进入了纵深发展和广泛应用的新的更成熟的阶段，一方面发展粒子的加速技术和探测技术，扩充人们研究原子核的手段，另一方面将核技术服务于国民经济中，例如，为核能的开发利用提供更为准确的核数据；利用同位素示踪技术诊断和治疗疾病；利用射线及辐照技术保存食品、辐照育种等。

We also show why this meson has not been seen in p experiments.

也说明为什么这个介子没有在p实验中发现的原因。

The possibilityof searching for light neutral scalar or pseudoscalar Higgs particles fromsubthreshold neutral pion production experiments in nucleus--nucleuscollision is also investigated.

本文研究了在〓介子核一核碰撞中的阈下产生实验中寻找轻的中性标量或〓标Higgs粒子的可能性。

Vodka:Colourless distilled liquor of neutral spirits usually made from a grain mash.

把你的尼龙衣服泡在中性皂的浓液中。双光子是在中性兀介子衰变中产生的。

By consideringthe formation time of secondary particles we have developed theparticipant nucleon model incorperating the secondary collisionsnaturally and calculated the increase of the 〓 ratio caused by thesecondary collisions of pions with target nucleons.

本论文另一研究工作就是通过考虑次级粒子的形成时间，自然地将参加者核子模型发展成为包括次级碰撞过程的模型，并根据此物理图象，计算了高能原子核一原子核碰撞过程中由于π介子与核子的次级碰撞过程而导致的次级粒子中的K+/π+比例的增加。

We adopted the new decomposition approach of the DBHF G-matrix, which was recently proposed by Schiller and Muether and calculate the Dirac structure of the nucleon self-energy.

通过分析不同的介子交换过程我们可以发现，来自能量无关的DBHF的直接项的贡献在核子自能中占主要的部分，自能的动量相关来自交换项的贡献，而G矩阵中的短程关联项ΔG减小了自能的强度。

The ratio of final baryon to meson and baryon antibaryon correlation in e +e - annihilation are considered as sensitive observables to test the hadronizition models,because among the results obtainted in different popular hadronizition models,only those from JETSET event generator can fit experimental data by adjusting extra ad hoc parameters.

在e+e-→h′s反应中，末态重子介子比及重子反重子关联，在流行的强子化模型中，仅有JETSET事件发生器能通过调节专用附加参数较好拟合实验，被认为是检验强子化模型的最敏感可观察量。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。